PRIX TOOLS / Marketing & advertising
A/B Test Significance Calculator
Enter visitors and conversions for A and B to examine rate difference, confidence interval and the stated test method.
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A/B Test Significance Calculator — steps and download
Enter visitors and conversions for A and B. Read conversion rates, difference and the two-sided test result together, then decide using your experiment plan.
Can I stop a test as soon as significance appears?
Repeated checking and early stopping can inflate false positives. The tool uses a normal approximation requiring enough successes and failures per group; follow the planned sample and duration.
Frequently asked questions
Does significance guarantee a business win?
No. Results depend on sample and assumptions; assess practical value and experiment design separately.
Can I stop a test as soon as significance appears?
Repeated checking and early stopping can inflate false positives. The tool uses a normal approximation requiring enough successes and failures per group; follow the planned sample and duration.
Are my files and input data uploaded?
Tool processing runs on your device; file and form contents are not sent to a server for processing. Loading the website still creates standard web requests. Using a contact link is a separate action.
Do I need an account or API key?
No account or API key is required for the tool. Use is free within the file, operation and device limits stated on the page.